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9.1 Problems with the Product Moment Cor... > 9.1.2 Heteroscedasticity and the Cla... - Pg. 445

Chapter 9 Correlation and Tests of Independence · · · 445 1 · · · · · · o · o o o · o o o o o · · · · · · o o o o o Y 0 o -1 o o o o o o o o · o · · o · o · · ·· · · · · o o o o -2 -2 · -1 0 X 1 2 Figure 9.3: An illustration that rotating points can alter Pearson's correlation. The dots have correlation r = 0.964. The points marked by an o are the dots rotated by 35 degrees; these rotated points have r = 0.81.